EP1217338B1 - Procédé d'assemblage d'un arrangement d'électrodes pour débitmètres magnéto-inductifs - Google Patents

Procédé d'assemblage d'un arrangement d'électrodes pour débitmètres magnéto-inductifs Download PDF

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Publication number
EP1217338B1
EP1217338B1 EP02004185A EP02004185A EP1217338B1 EP 1217338 B1 EP1217338 B1 EP 1217338B1 EP 02004185 A EP02004185 A EP 02004185A EP 02004185 A EP02004185 A EP 02004185A EP 1217338 B1 EP1217338 B1 EP 1217338B1
Authority
EP
European Patent Office
Prior art keywords
measuring
measuring tube
electrode
shaft
moulding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02004185A
Other languages
German (de)
English (en)
Other versions
EP1217338A2 (fr
EP1217338A3 (fr
Inventor
Oliver Graf
Michael Schoohf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Endress and Hauser Flowtec AG
Original Assignee
Endress and Hauser Flowtec AG
Flowtec AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Endress and Hauser Flowtec AG, Flowtec AG filed Critical Endress and Hauser Flowtec AG
Publication of EP1217338A2 publication Critical patent/EP1217338A2/fr
Publication of EP1217338A3 publication Critical patent/EP1217338A3/fr
Application granted granted Critical
Publication of EP1217338B1 publication Critical patent/EP1217338B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
    • G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
    • G01F1/584—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters constructions of electrodes, accessories therefor

Definitions

  • the invention relates to a method for assembling an electrode arrangements for magnetic-inductive Human Fluorescence
  • Magnetic-inductive flowmeters can be known to measure the volume flow of electrically conductive liquids.
  • the measurement is based on Faraday's law of induction.
  • the liquid is passed through a magnetic field, so that in it an electrical voltage is induced, which is tapped by means of at least two electrode arrangements.
  • the means for guiding the liquid in the form of a measuring tube, for generating the magnetic field, the electrode arrangements and optionally further components form the magnetic-inductive Humanassisted ultrasound (US)
  • the electrode arrangements and optionally further components form the magnetic-inductive Humanassisted ultrasound (US)
  • the measuring tube must be made of an insulating material at least in the region of the magnetic field, so that the induced voltage is not short-circuited. Therefore, metallic measuring tubes are internally coated with a suitable insulating material.
  • metal measuring tubes must not be made of ferromagnetic material so that the magnetic field generated by means of a coil arrangement arranged outside the measuring tube can reach and pass through the liquid.
  • the metallic measuring tubes are therefore made of stainless steel, the outer surface is thus stainless and usually does not need to be treated further.
  • An electrode assembly comprises a measuring electrode having a head and a stem fixed in a bore of the wall of the measuring tube so as to be electrically insulated therefrom. This isolation must be very good, because the induced voltage has only small values of the order of 1 mV and their internal resistance can be in the order of 100 k ⁇ .
  • insulation resistance As a measure of the quality of the insulation is usually the ohmic insulation resistance, which exists between the measuring electrode and the measuring tube. In dry conditions, insulation resistance values are usually on the order of 100 M ⁇ .
  • An advantage of the invention is that the fact that no liquid film can form on the hydrophobic molded body, the reduction of the insulation resistance is avoided and the induced voltage is not attenuated. Therefore, there are also no long-term variations in the insulation resistance, which led to interference voltages that would be superimposed on the induced voltage.
  • Fig. 1 partially shown in Lijnsschnit first electrode assembly, this is shown in an already installed in a measuring tube 1 of a magnetic-inductive Human Forces, this is shown in an already installed in a measuring tube 1 of a magnetic-inductive Human Forces, this is shown in an already installed in a measuring tube 1 of a magnetic-inductive Human Forces, this is shown in an already installed in a measuring tube 1 of a magnetic-inductive Human Forces state. From the measuring tube 1, only an electrode-near part is shown, and it consists of a metallic, non-ferromagnetic material, esp. Of a stainless steel.
  • the measuring tube 1 is internally provided with an insulating material 2, which may be one of the usual for this purpose in the art of magnetic-inductive flow meter materials, eg polytetrafluoroethylene, hard rubber, soft rubber, etc.
  • an insulating material 2 which may be one of the usual for this purpose in the art of magnetic-inductive flow meter materials, eg polytetrafluoroethylene, hard rubber, soft rubber, etc.
  • Polytetrafluoroethylene is required as an insulating material 2.
  • An outer surface 11 of the measuring tube 1 is left untreated in its manufacture, so bare.
  • An electrode assembly 3 comprises a measuring electrode 4 with a head 41 and a shaft 42 which has a smaller diameter than the head 41 and is provided with an external thread 43.
  • the measuring electrode 4 is inserted in a bore 12 of a wall of the measuring tube 1 by means of an insulating body 5, so that the measuring electrode 4 and measuring tube 1 are electrically isolated from each other.
  • the insulating body 5 has a disk-shaped part 51 and a tubular, in the bore 12 mating approach 52.
  • the disk-shaped part 51 has a diameter which is larger than the outer diameter of the projection 52.
  • the approach 52 is slightly shorter than the wall of the measuring tube 1 is thick.
  • the approach 52 is sufficient to the insulating material 2, since this is pressed by the head 41 against the wall of the measuring tube 1. As a result, the first cavity existing between the end of the projection 52 and the outer surface of the measuring tube 1 is filled.
  • a cylindrical mold part 6 has a bottom 61 and a wall part 62 and is made of an electrically insulating, hydrophobic material; Perfluoroalkoxy is particularly well suited for this purpose.
  • the bottom 61 there is a central opening 63 with a diameter which is smaller than the diameter of the disk-shaped part 51 of the insulating body 5.
  • the bottom 61 engages under the disc-shaped part 51 and can be pressed against the outer surface 11 of the measuring tube 1.
  • the disc-shaped member 51 may be formed stepped so that a lower nozzle 53 has a diameter corresponding to the diameter of the central opening, so that the nozzle 53 fits into this exactly.
  • the thickness of the nozzle 53 is slightly smaller than the thickness of the bottom 61, so that it is in the finished state, as mentioned, securely pressed against the outer surface 11 of the measuring tube 1.
  • the wall portion 62 of the molding 6 has an inner diameter slightly larger than the diameter of the disk-shaped portion 51. Thus, this fits into the molding 6.
  • the electrode assembly 3 further comprises a spring part 7, which here is a double-acting spring element, two washers 8 and a nut 9.
  • the components of the electrode assembly 3 are assembled as follows and in the order given: First, the measuring electrode 4 is inserted from the inside through the bore 12 of the measuring tube 1; in this it holds itself. At the lower part of the shaft 42 mounted grooves 44 serve the distinctness of various materials used for the measuring electrode 4, such as the stainless steel 1.4435, the stainless steel Hast C 22, a chromium-nickel steel, a platinum Rhodium alloy with 20 atom% rhodium or tantalum etc.
  • the molding 6 and the insulating body 5 are pushed onto the shaft 42 and the projection 52 centered in the bore 12. Now one of the two washers 8 is pushed onto the shaft 42 and above the spring part 7 and above the second of the washers 8. Finally, the nut 9 is screwed and tightened so that the spring member 7 is set under compressive stress.
  • the bottom 61 of the molding 6 is pressed against the outer surface 11 of the measuring tube 1 and on the other hand, the head 41 of the measuring electrode 4 is pulled firmly against the polytetrafluoroethylene as insulating material 2 and forms a small depression therein.
  • the head 41 is securely sealed against the liquid flowing in the measuring tube 1, and the part of the electrode assembly 3 outside the measuring tube 1 is protected against moisture, e.g. from the outer surface 11 of the measuring tube 1 to the measuring electrode 4 seeks to crawl. Furthermore, it is reliably prevented by the hydrophobic molding 5 that a condensation film between the outer surface 11 and the measuring electrode 4 can build up.
  • Fig. 1 is still shown in the finished state, as the electrode assembly 3 can be connected to an electrical supply line 10.
  • a further nut 13, a Lötinate 14, with which the supply line 10 is soldered, and a snap ring 15. are attached as shown on the thread 43 of the measuring electrode 4 by tightening the nut 13.
  • Fig. 2 are partially in longitudinal section two variants of a second electrode assembly 3 'shown, in such a way that of the one variant, only the left half and of the other variant only the right half can be seen.
  • Fig. 2 are only such reference numerals Fig. 1 repeated, for explanation of Fig. 2 required are. There are only the differences of Fig. 2 compared to Fig. 1 explained.
  • the left variant differs from the right in that the left variant is intended for larger diameters than the right variant, so that the measuring electrode 4 'is made longer and the insulating material 2' thicker.
  • the head 41 requires a sealing ring 16 made of polytetrafluoroethylene. This is below the neck 52 'in the bore of the wall of the measuring tube 1', which extends slightly into the insulating material 2 'inserted, and contributes to the sealing of the head 41' and the adjacent parts of the shaft 42 'of the measuring electrode 4' at ,
  • the insulating body 5 ' is here the entire inner contour of the molding 6' adapted, ie it extends to the upper edge of the latter. In this area, the insulating body 5 'is further formed multiple slotted.
  • a spring member 7 ' is instead of a double-sided spring element as in Fig. 1 provided a snap ring. Both types of spring parts are of course interchangeable.
  • the components of the electrode assembly 3 ' are assembled as follows and in the order given: First, the measuring electrode 4 'is inserted from the inside through the bore of the measuring tube 1'; in this it holds itself. Then in the insulating body 5 'is a washer 81 of the snap ring 7' and another washer 82 is inserted through. Then the molded part 6 'and then the insulating body 5' prepared as described above are pushed onto the shaft 42 '. Finally, the nut 9 'is screwed and tightened so that the snap ring 7' is set under compressive stress.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Claims (7)

  1. Procédé destiné à l'assemblage d'un dispositif d'électrode (3) d'un débitmètre magnéto-inductif, lequel procédé comprend les étapes suivantes :
    - une électrode (4) présentant une tête (41) et une tige (42) est introduite depuis l'intérieur à travers un perçage (12) d'une paroi d'un tube de mesure (1) du débitmètre, tube dont l'intérieur est pourvu d'une matière isolante (2), et
    - une pièce moulée (6) présentant un fond (61), une partie de paroi (62) ainsi qu'une ouverture centrale se trouvant dans le fond (61), constituée d'une matière hydrophobe, ainsi qu'une partie en forme de disque (51) et un corps isolant (5) présentant un épaulement (52) s'adaptant dans le perçage (12), sont engagés sur la tige (42) et fixés de telle sorte que le fond (61) de la pièce moulée (6) est maintenu pressé de l'extérieur, et la tête (41) de l'électrode (4) est maintenue pressée de l'intérieur contre la paroi du tube de mesure (1).
  2. Procédé selon la revendication 1, comprenant en outre les étapes suivantes :
    - engagement d'une pièce élastique (7) sur la tige (42) de l'électrode de mesure (4) et
    - engagement d'un écrou (9) sur la tige (42) pour la création d'une contrainte de compression visant à presser une pièce moulée (6) et l'électrode de mesure (4) contre la paroi du tube de mesure (1), dans la pièce élastique (7).
  3. Procédé selon la revendication 1, comprenant en outre les étapes suivantes:
    - engagement d'un circlips (7') sur la tige (42) de l'électrode de mesure (4) et
    - engagement d'un écrou (9) sur la tige (42) pour la création d'une contrainte de compression visant à presser une pièce moulée (6) et l'électrode de mesure (4) contre la paroi du tube de mesure (1), dans le circlips (7').
  4. Procédé selon la revendication 2 ou 3, pour lequel le fond (61) de la pièce moulée (6), d'une part, est pressé par la tension de compression contre une surface extérieure (11) du tube de mesure (1) et, d'autre part, la tête (41) de l'électrode de mesure (4) est tirée fermement contre la matière isolante (2).
  5. Procédé selon l'une des revendications précédentes, pour lequel la pièce moulée (6) est en perfluoroalkoxy (PFA).
  6. Procédé selon l'une des revendications précédentes, pour lequel il s'agit, concernant le matériau utilisé pour l'électrode de mesure (4), d'un des matériaux suivants : un acier inoxydable 1.4435, un acier inoxydable Hast C 22, un acier au chrome-nickel, un alliage platine-rhodium avec 20 % d'atomes de rhodium ou de tantale.
  7. Procédé selon l'une des revendications précédentes, pour lequel la matière isolante se compose de l'une des matières suivantes : polytétrafluoréthylène (PTFE), caoutchouc dur, caoutchouc tendre.
EP02004185A 1998-07-27 1998-07-27 Procédé d'assemblage d'un arrangement d'électrodes pour débitmètres magnéto-inductifs Expired - Lifetime EP1217338B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19980114000 EP0977018B1 (fr) 1998-07-27 1998-07-27 Arrangement d'électrodes pour débitmètres magnéto-inductives

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP19980114000 Division EP0977018B1 (fr) 1998-07-27 1998-07-27 Arrangement d'électrodes pour débitmètres magnéto-inductives

Publications (3)

Publication Number Publication Date
EP1217338A2 EP1217338A2 (fr) 2002-06-26
EP1217338A3 EP1217338A3 (fr) 2003-08-06
EP1217338B1 true EP1217338B1 (fr) 2008-04-02

Family

ID=8232351

Family Applications (2)

Application Number Title Priority Date Filing Date
EP02004185A Expired - Lifetime EP1217338B1 (fr) 1998-07-27 1998-07-27 Procédé d'assemblage d'un arrangement d'électrodes pour débitmètres magnéto-inductifs
EP19980114000 Expired - Lifetime EP0977018B1 (fr) 1998-07-27 1998-07-27 Arrangement d'électrodes pour débitmètres magnéto-inductives

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP19980114000 Expired - Lifetime EP0977018B1 (fr) 1998-07-27 1998-07-27 Arrangement d'électrodes pour débitmètres magnéto-inductives

Country Status (5)

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EP (2) EP1217338B1 (fr)
JP (1) JP3043759B2 (fr)
CN (1) CN1096603C (fr)
DE (2) DE59814203D1 (fr)
DK (1) DK1217338T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022118729A1 (de) 2022-07-26 2024-02-01 Endress+Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10312824B4 (de) * 2003-03-22 2007-04-05 Siemens Flow Instruments A/S Magnetisch-induktiver Durchflußmesser
DE102006005116A1 (de) * 2005-12-23 2007-07-05 Abb Patent Gmbh Elekrode für ein induktives Durchflussmessgerät
DE102007005599B4 (de) * 2007-01-31 2024-03-28 Endress + Hauser Flowtec Ag Messrohr für ein Durchflussmessgerät
JP2009180603A (ja) 2008-01-30 2009-08-13 Toshiba Corp 測定装置
DE102008059067A1 (de) 2008-11-26 2010-06-02 Krohne Ag Magnetisch-induktives Durchflußmeßgerät
JP5202368B2 (ja) * 2009-02-03 2013-06-05 株式会社東芝 測定装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3177709A (en) * 1961-04-04 1965-04-13 Fischer & Porter Co Magnetic flowmeter
GB2047409B (en) * 1979-03-21 1983-04-20 Davies P M Electrodes for electromagnetic flowmeters
US4517846A (en) * 1983-06-13 1985-05-21 Flowmetering Instruments Limited Electromagnetic flowmeter
US5773723A (en) * 1995-09-29 1998-06-30 Lewis; Peter B. Flow tube liner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022118729A1 (de) 2022-07-26 2024-02-01 Endress+Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät

Also Published As

Publication number Publication date
CN1249423A (zh) 2000-04-05
EP1217338A2 (fr) 2002-06-26
DK1217338T3 (da) 2008-08-04
DE59803198D1 (de) 2002-04-04
EP1217338A3 (fr) 2003-08-06
CN1096603C (zh) 2002-12-18
DE59814203D1 (de) 2008-05-15
EP0977018B1 (fr) 2002-02-27
JP2000046604A (ja) 2000-02-18
EP0977018A1 (fr) 2000-02-02
JP3043759B2 (ja) 2000-05-22

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